Hide mobile sidebar on some clicks

When the user clicks outside the sidebar, the sidebar should close.
Also, when the user clicks an internal link in the sidebar, it should
close.

Author: jsha

src/librustdoc/html/static/js/main.js

@@ -897,6 +897,9 @@ function hideThemeButtonState() {
     handleClick("help-button", function(ev) {
         displayHelp(true, ev);
     });
+    handleClick(MAIN_ID, function() {
+        hideSidebar();
+    });
 
     onEachLazy(document.getElementsByTagName("a"), function(el) {
         // For clicks on internal links (<A> tags with a hash property), we expand the section we're
@@ -905,6 +908,7 @@ function hideThemeButtonState() {
         if (el.hash) {
             el.addEventListener("click", function() {
                 expandSection(el.hash.slice(1));
+                hideSidebar();
             });
         }
     });

src/test/rustdoc-gui/sidebar-mobile.goml

@@ -18,3 +18,11 @@ assert-css: (".sidebar-elems", {"display": "block", "left": "0px"})
 // When we tab out of the sidebar, close it.
 focus: ".search-input"
 assert-css: (".sidebar-elems", {"display": "block", "left": "-246px"})
+
+// Open the sidebar menu.
+click: ".sidebar-menu"
+assert-css: (".sidebar-elems", {"left": "0px"})
+
+// Click elsewhere.
+click: "body"
+assert-css: (".sidebar-elems", {"left": "-246px"})